Original Article
European Journal of Clinical Nutrition (2008) 62, 537–543; doi:10.1038/sj.ejcn.1602740; published online 21 March 2007
Minimizing random error in dietary intakes assessed by 24-h recall, in overweight and obese adults
Contributors: KAJ was the principal investigator for the study, which was conducted as part fulfillment for the Doctor of Philosophy at the Queensland University of Technology. Co-author APH is the principal supervisor for the principal investigator's PhD candidature, and NMB and AMM are associate supervisors. KAJ was responsible for the conception, design, conduct of the experiment, data analysis and interpretation, and writing of the paper. APH and NMB provided advice on study design, data interpretation and statistical analyses, and support for participant recruitment. AMM provided advice on study design and data interpretation. APH gave final approval of the paper.
K A Jackson1,2, N M Byrne2, A M Magarey3 and A P Hills2
- 1School of Health Sciences, University of South Australia, Adelaide, Australia
- 2Institute of Health and Biomedical Innovation, School of Human Movement Studies, Queensland University of Technology, Brisbane, Australia
- 3Department of Nutrition and Dietetics, School of Medicine, Flinders University, Bedford Park, Australia
Correspondence: KA Jackson, School of Health Sciences, University of South Australia, GPO Box 2471, Adelaide, 5001, South Australia, Australia. E-mail: kathryn.jackson@unisa.edu.au
Received 16 October 2006; Revised 8 February 2007; Accepted 19 February 2007; Published online 21 March 2007.
Abstract
Objective:
To determine the minimum number of days of dietary intake interviews required to reduce the effects of random error (day-to-day variability in dietary intake) when using the multiple-pass, multiple-day, 24-h recall method.
Design:
Cross-sectional study.
Setting:
University research department.
Subjects:
A total of 50 healthy non-smoking overweight and obese (body mass index=26–40 kg/m2) adult men and women aged 39–45 years completed the study. Participants were randomly selected from volunteers for a larger unrelated study.
Interventions:
Each participant completed 10, multiple-pass, 24-h recall interviews on randomly chosen days over 4 weeks. The minimum number of record days was determined for each macronutrient (carbohydrate, fat, protein) and energy, for each gender, to obtain a 'true' (unobservable) representative intake from reported (observed) dietary intakes.
Results:
The greatest number of days required to obtain a 'true' representative intake was 8 days. Carbohydrate intakes required the greatest number of days of dietary record among males (7 days), whereas protein required the greatest number of days among females (8 days) in this cohort. Sunday was the day of the week that showed greatest variability in macronutrient intakes. Protein (P<0.05) and fat (P<0.001) intakes were significantly more variable than carbohydrate on Sundays compared with weekdays, for both men and women.
Conclusion:
A logistically achievable 8 days of dietary intake interviews was sufficient to minimize the effect of random error when using the multiple-pass, 24-h recall dietary intake method. Sunday should be included among the dietary interview days to ensure a 'true' representation of macronutrient intakes. This method can be confidently applied to small cohort studies in which dietary intakes from different groups are to be compared or to investigations of associations between nutrient intakes and disease.
Keywords:
random error, day-to-day variability, dietary intake methodology, 24-h recall, obesity, week-end dietary intakes
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